21276055052 has 48 divisors (see below), whose sum is σ = 43997603328. Its totient is φ = 8812721280.

The previous prime is 21276055043. The next prime is 21276055063. The reversal of 21276055052 is 25055067212.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36233 + ... + 209439.

It is an arithmetic number, because the mean of its divisors is an integer number (916616736).

Almost surely, 2^21276055052 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21276055052, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21998801664).

21276055052 is an abundant number, since it is smaller than the sum of its proper divisors (22721548276).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21276055052 is a wasteful number, since it uses less digits than its factorization.

21276055052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173366 (or 173364 counting only the distinct ones).

The product of its (nonzero) digits is 42000, while the sum is 35.

The spelling of 21276055052 in words is "twenty-one billion, two hundred seventy-six million, fifty-five thousand, fifty-two".